HTTP/2, HTTP/3, and CDN Caching: Read Page Speed from a Waterfall
A deterministic browser-waterfall model for HTTP/2, HTTP/3, QUIC streams, and CDN cache hits or misses.
Network Fundamentals
DNS Resolution Explained: Build a TTL Cache and Packet Parser in Python
A runnable DNS guide covering resolution paths, response headers, TTL cache latency, and deterministic Python/C experiments.
CIDR, Longest Prefix Match, and MTU: Calculate IP Routing Step by Step
Calculate CIDR ranges, longest-prefix route choice, and MTU/MSS payload segmentation with runnable Python and C examples.
TCP Reliability and Congestion Window: A Runnable Sequence Number Experiment
Track TCP sequence numbers, cumulative ACKs, loss, retransmission, and congestion-window changes with safe local experiments.